Apparatus for securing gems to arbors.



C. J. COLEMAN.

*APPARATUS FOR SECURING GEMS TO ARBORS.

APPLICATION FILED NOV.25,1912.'

Patented Jan. 18, 1916.

I 4 1 I I 1 I I 1 I 1 I I, 1/

yi/bneooeo J 5] woe ntoz rnvrrnp srn rns rarnnr cannon.

CLYDE J. COLEMAN, OF NEVT ROCHELLE, NEW YORK, ASSIGNOR, BY I/IESNE ASSIGN- MENTS, TO STERN-COLE1VIAN DIAMOND MACHINE COMPANY, INC., A CORPORATION OF NEW YORK.

APPARATUS FOR SECURING GEMS TO ARBURS.

Specification of Letters Patent. Patentedfian, 18, 191$.

Application filed November 25, 1912. Serial No. 733,421.

'ularly to apparatus for securing gems to arbors or holding means'during or before the polishing operation' In my co-pendmg appllcation, Serial Number 733,417, filed on even date here with, I have described and claimed an automatic machine for polishing gems in which the gem is cemented in the cupped end of a carbon arbor secured in the dop-holding head of the machine. In order that the gem may be presented to the lap to properly polish all the facets in a symmetrical arrangement about the geometric center of the gem, it is essential that the gem be arranged in the arbor in axial alinement therewith, and in my co-pending application, Serial Number 733,420, filed on even date herewith, I have described and claimed means for inserting a bruted gem in an arbor in axial alinement with the arbor. Aftcr'the facets on the exposed portion of the gem on one side of the girdle have been polished, the gem is transferred to another arbor with the unpolished portion of the gem exposed, and then the facets are polished on that side of the girdle.

An object of my invention is to provide simple, reliable and convenient means for securing a gem in the'arbor or holding means and transferring the gem to the second arbor or holding means in axial alinement there:

I with.

I provide two arbors arranged in alinement with their cupped ends adjacent and means for bringing thern'together along the'common line and inserting the exposed portion of the gem into the socket of the second or receiving arbor, a suitable cement having previously been. put into the socket, means being provided for applying sufficient heat to bake the cement, and then breaking off the first or holding arbor. Means are provided for excluding oxygen from the space surrounding the arbors when heat is applied in case the cement and arbors used would be oxidized under the baking heat.

More particularly, as means for carrying out my invention, I provide two arbor holders arranged to hold the arbors in axial alinement with their cupped ends adjacent, at least one of the holders being adjustable on a suitable guide support along the com-' mon axial line to insert the projecting portlon of the gem into the cement-containing socket of the second or receiving arbor, and

a source of heat adjacent the abutting ends sufficient to bake the cement. More specifically the source of heat is a small elec tric furnace also adjustable along the guide support. Still more specifically, the apparatus is contained in a receptacle from which an oxidizing atmosphere is excluded. Preferably the apparatus is all carried by the stopper of the receptacle to facilitate its removal.

Various other features and details of construction and combinations and arrange Figure l is a partial vertical central sec- I tion and partial elevation of an apparatus embodying my lnventlon. Fig. 2 1s a horizontal section of the same on line 2-2, looking down, and turned in aclockwise direction. Fig. 3 is an enlarged central vertical section of the electric furnace. Fig. 4 is a horizontal section of the parts shown'in Fig. 1, on line 4-4, looking up and turned 90 in a clockwise direction. Fig. 5 isa detail, partially in section, of the adjacent ends of the two arbor-s in axial alinement, in their relative posltions as they approach each other.

lhe arbor holders 1' and 2 are contained in a cylindrical receptacle 3 of glass or other vitreousmaterial,andopen at'its'upper end.

These arbor holders are slidably mounted in a vertical V-shape guide groove on a guide support 4, which is secured by bolts 5 to the stopper 6 of the receptacle 3 and extends downward into the receptacle. The arbor holders are cylindrical and have a concentric arbor-holding extension of reduced diameter provided with a tapered bore for the reception of the arbors, the arbor holder 1 being shown as holding the holding arbor 7 from which the gem is to be transferred, and the arbor holder 2 holding the receiving arbor 8 to which the gem is to be transferred. Each arbor is provided with an arbor-displacing screw 9, which extends axially through the arbor holder and is arranged to abut against the inner end of the arbor and loosen the arbor as the displacing screw is manually turned. To hold the arbor holders in the V-shape groove of the guide support 4, while permitting movement longitudinally of the guide groove, resilient tension straps 10 of general U-shape are provided which embrace the arbor holders and have their ends turned inward, as shown, to engage in grooves in the rear edges of the guide support 4:. These tension straps are positively secured to the arbor holders by thumb screws 11.

The arbor holders 1 and 2 are arranged with the socket ends of the arbors adjacent as shown and with the arbors in axial alinement, and this axial alinement is maintained as the arbors are made to approach or recede from each other. It is, therefore, ap parent that, since the gem 12 was originally arranged in axial alinement with the holding arbor 7, it is also in axial alinement with the receiving arbor 8, and as the two arbors are brought together, the projecting portion of the gem 12 on which the facets have been polished will enter the socket in the end of the receiving arbor S, which socket has previously been filled with suitable cement.

To bake the cement and thus fasten the polished end of the gem 12 in the socket of the receiving arbor 6, a small electric fur nace is provided also sliclably mounted upon the guide support 4:. This electric furnace comprises a block 13 of asbestos, wood, or other heat-insulating material, and a tube 14: of refractory material such as quartz, around which is Wound a suitable electrical conductor 15, such as a coil of platinum wire. The lead wires 16 connected to the ends of this coil 15 enter through the stopper 6 as shown in Fig. 1. The block 13 is of general oblong shape in elevation, its two lower edges being beveled off, as shown in Fig. 2, to fit into the V-shape groove of the guide support 4, and a flat tension spring 17 is secured at one end on the tension strap 10 about the arbor holder 2 by the thumb screw 11 and a lock nut 18, and bears with its ther and the 19. at the l c 1 nd holds the electric furnace in the guide groove while permitting it to be adjusted longitudinally of the guide groove. The bore of the tube ll is disposed in line with the arbors 7 and 8 so that the abutting ends of the arbor are adapted to enter the tube 11, as shown in Fig. 1.

It will be noted that all of the apparatus in the receptacle is carried by the stopper 6 and the parts may, therefore, be adjusted outside of the receptacle and inserted as a unit into the receptacle at the time that the receptacle is closed by inserting'the stopper 6. To prevent the arbors from oxidizing when subject to the intense heat of the electric furnace, oxidizing atmosphere is excluded from the receptacle and this is pref erably done by introducing a hydro-carbon gas such as illuminating gas into the receptacle through a conduit 19 in the stopper 6, admission to which is controlled by a cock 20. The displaced air may be allowed to escape by leaving the'stopper 6 loose until the receptacle is filled with gas or in any other suitable way. To insure the absence of oxygen, the gas may be left turned on throughout the whole operation.

In operation the stopper 6 and the parts carried thereby are removed from the receptacle 3 and the arbors 7 and 8 are inserted in their respective arbor holders, and the arbors are then brought together until the projecting portion of the gem 12 enters the cement-containing socket in the arbor 8. The electric furnace is then adjusted so as to surround the abutting ends of the arbors, and the stopper is then inserted into the receptacle 3, after which the receptacle is filled with a non-oxidizing gas through the conduit 19. The electric circuit for the electric furnace is then closed and the cement in the socket of the arbor 8 is baked, after which the parts are taken out of the receptacle, the arbors removed from their holders and the arbor 7 is detached as by breaking it off from the gem 12. Any other suitable baking arrangement may be used within the broader aspect of my invention.

It is obvious that various other modifications may be made in the construction shown in the drawings and above particularly described within the prineiple and scope of my invention.

I claim:

1. Apparatus for securing gems in arbor-s comprising a suitable frame, arbor holding means carried thereby, gem holding means carried thereby and adapted to hold the gem in the cement containing end of the arbor in proper alinement with the arbor, and

means carried thereby, gem holding means projecting from one inserted into the oc- Inent-containing socket of the other, and a source of heat adjacent the holders for baking the cement. r

at. Apparatus'for transferring gems from one geinholder to another, having 1n combination means for holding the gem-holders n axial alinement wlth the portionof the gem projecting from one inserted into the cefrom mentcontainingsocket of the other, an electric furnace adjacent the holders for baking the cement, and a sealed container for the r device, whereby the parts may be kept in a non-oxidizing atmosphere.

5. Means for transferring gems from one arbor to another comprising two arbor holders arranged to hold the arbors in axial alinement with their socket ends adjacent, one of the holders being movable toward and its cooperative holder common axial line-to insert the portionof .the gem projecting from the first arborinto the cement-containing socket of the second arbor, and a source of heat at the juncture of the two arbors sutlicient to bake the cement. I 1

' 6. Meansifor transferringgems from one arbor to another comprising two arbor holders arranged to hold the arbors in axial alinement with their socket ends adjacent, a

guide support for the arbor holders, one of the holders being adjustable on the guide support along thecommon axial line toward and from its cooperative holder to insert the; portion of the gemprojecting from the'first arbor into the cement-containing socket of l the second arbor, and an electric furnace mounted on the guide support and adjustable along the length thereof to bring it into proximity to the juncture of the two arbors to bake the cement.

7. Means for transferring gemsfrom one arbor to-another co-mprisinga receptacle, a source of non-oxidizing atmosphere therefor, two arbor holders in the receptacle arranged to hold the arbors in axial aline- *ment with their socket ends adjacent, a

guide support for the arbor holders, the

' holders being adjustable on the guidesupport along the common axial line toflinsert the portion of the gem projecting fromv the into the .cementcontaining socket of the second arbor, and an electric first arbor along the electric furnace on the guide support and adjustablealong thefllength thereof to bring it into proximity to the juncture of the two 'arbors to bake the cement.

arranged to hold the arbors in axial aline ment with their socket ends adjacent, a

guide support for the arbor holders, the

holders being adjustable on the guide sup port along the common axial line toinsert the portion of the gem projecting from the arbor into the prising a block of heat-insulating material, a tube of refractory material extending through the block, and electric conducting wireson the tube, the electric furnace being disposed with the vbore of the tube in alinement with the arbors and being adjustable along the guide support to surround the juncture of the two arbors to bake the cement. t

9. Means for transferring gems from one arbor to another comprising a receptacle, a stopper for the receptacle, a conduit of nonoxidizing atmosphere for the, receptacle entering through the stopper, two arbor holders in the receptacle arranged to hold the arbors in axial alinement with their socket ends adjacent,*a guide-support'for the arbor holders carried by the stopper,

support along the common axial line to insert the portion of the gem projecting from the first arbor into the cement-containing socket of the second arbor, an electric furnace on the guide support and adjustable along the length thereof to bringit into proximity to the juncture of the two arbors to bake thecement, and lead wires for the furnace entering" through the stopper.

10. Means for transferring gems from one arbor to another comprising a receptacle, astopper for the receptacle, a conduit of non-oxidizing atmosphere for the recement-containing socket of the second arbor, and an electric "furnace carried by the guide support comcentacle entering through the stopper, two

arbor holders in the receptacle arranged to hold the arbors in axial alinement with their socket ends adjacent, a guide 'support 3 for the arbor holders carried by the stop- .per, the holdersbeing ad ustable on the guide support along the common axial line to insert the portion ofthe gem projecting from the first arbor into the cement containing socket of the second arbor, and an electric furnace carried by the guide support comprising a block of heat-insulating material, a tube of refractory material extending through the block, and electric conducting wireson the tube, the electric furnace being disposed with the bore of the tube in alinement With the arbors and being adjustable along the guide support to surround the juncture of the two arbors to bake the cement.

11. Apparatus for securing gems to arbors comprising a suitable frame, a gem holding arbor carried thereby, means for insertinga gem in a cement-containing socket in the arbor, and heating means for baking the cement to secure the gem to the arbor thereby.

12. Apparatus for securing gems to arbors comprising a suitable frame, a gem holding arbor carried thereby, means for inserting a gem in a cement-containing socket in the arbor, heating means for baking the cement to secure the gem to the arbor thereby, and a container for inclosing the gem and cement during the baking.

In testimony whereof I have atfixed my signature in the presence of two Witnesses.

CLYDE J. COLEMAN. Witnesses:

VICTOR D. Boner, WVM. A. KELLY.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents.

' Washington, D. C. 

